dnl Thanks to gperftools' configure.ac (https://code.google.com/p/gperftools).
AC_MSG_CHECKING([for __builtin_expect])
dnl Thanks to gperftools' configure.ac (https://code.google.com/p/gperftools).
AC_MSG_CHECKING([for __builtin_expect])
AC_ARG_ENABLE([warnings],
[AS_HELP_STRING([--enable-warnings],[enable warning output])],
[if test "x$enableval" = xyes; then
AC_ARG_ENABLE([warnings],
[AS_HELP_STRING([--enable-warnings],[enable warning output])],
[if test "x$enableval" = xyes; then
fi])
AC_ARG_ENABLE([debug],
[AS_HELP_STRING([--enable-debug],[enable debug output])],
[if test "x$enableval" = xyes; then
fi])
AC_ARG_ENABLE([debug],
[AS_HELP_STRING([--enable-debug],[enable debug output])],
[if test "x$enableval" = xyes; then